An object of this invention is to provide an improved stormwater diversion device that offers a more precise, easy to install and accurate means for diverting stormwater flow than any of the aforementioned prior art techniques. Referring now to the drawings, a flow rate gauge (1) is displayed on top of the apparatus clearly allows the installer to easily calibrate the device's potential flow rate to fit any particular need/situation without having to change the dimension of the box itself. Quite simply, after the device is fitted to the storm sewer structure, and the structure (e.g. inlet box) is installed in the field; the installer is merely required to use a lug wrench to either accommodate more flow, by turning the adjustment nut (2) counter-clockwise resulting in the movement (opening) of the gate (3) along the track (4) or reduce the allowed flow rate, by turning clockwise resulting in the movement (closure) of the gate (3) along the track (4). While the movement of the gate adjusts the aperture (orifice) size, the gauge (1) will continually allow the installer to observe what flow rate would be achieved depending on the setting of the gate (3). A qualified engineer knowledgeable in hydrological methods would determine the selected flow rate required.
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